DESCRIPTION
The is a control circuit for use in switched-mode power supplies. This single monolithic chip incorporates all the control and housekeeping (protection) functions required in switched-mode power supplies, including an internal temperature-compensated reference source, internal Zener references, sawtooth generator, pulse-width modulator, output stage and various protection circuits.
VCC 2 16 FEEDFORWARD 15 OUTPUT (COLL) 14 OUTPUT (EMIT) 13 DEMAG: OVERVOLTAGE 12 GND 11 CURRENT LIMITING 10 REMOTE ON/OFF 9 EXTERNAL SYNC
FEATURES
· Stabilized power supply· Temperature-compensated reference source· Sawtooth generator· Pulse-width modulator· Remote on/off switching· Current limiting· Low supply voltage protection· Loop fault protection· Demagnetization/overvoltage protection· Maximum duty cycle clamp· Feed-forward control· External synchronization
DESCRIPTION 16-Pin Plastic Dual In-Line Package (DIP) 16-Pin Plastic Small Outline Large (SOL) Package 16-Pin Plastic Dual In-Line Package (DIP) 16-Pin Cerdip Dual In-Line Package (CERDIP)
SYMBOL Supply1 VCC ICC IOUT Voltage-forced mode Current-fed mode Output transistor (at 20-30V max) Output current Collector voltage (Pin 15) Max. emitter voltage (Pin 14) TA Operating ambient temperature range SE5560 NE5560 TSTG Storage temperature range NOTES: 1. Does not include current for timing resistors or capacitors. V mA PARAMETER RATING UNIT
FEED FORWARD 16 EXTERNAL RT CT SYNC INPUT 7 8 DEMAGNETIZATION OVER-VOLTAGE PROTECTION 13 0.6V
REFERENCE VOLTAGE 0.48V FEEDBACK VOLTAGE GAIN ADJUST MODULATOR INPUT 0.6V
10 REMOTE ON/OFF NOTE: 1. See Voltage/Current fed supply characteristic curve.
TA=25°C, VCC=12V, unless otherwise specified. SYMBOL Reference sections VREF Internal reference voltage Temperature coefficient of VREF VZ Internal Zener reference Temperature coefficient of VZ Oscillator section Frequency range Initial accuracy oscillator Duty cycle range Modulator Modulation input current Housekeeping function IIN` Pin 6, input current At 2V Over temperature For 50% max duty cycle of VZ Pin 1, low supply voltage protection thresholds Pin 3, feedback loop protection trip threshold At 2V Pin 3, pull-up current Pin 13, demagnetization/over-voltage protection trip on threshold IIN Pin 13, input current Pin 16, feed-forward duty cycle control *Pin 16, feed-forward input current External synchronization Pin 9 Off On Sink current Remote Pin 10 Off At 0V Sink current 25°C Over temperature VZ V Voltage at Pin 9=0V, 25°C Over temperature V µA Over temperature 0.25V 25°C Over temperature Voltage at Pin VCC=18V 25°C Over temperature µA original duty cycle mV of duty cycle mV µA Voltage at Pin 5=2V Over temperature µA Over temperature 7.8 25°C Over temperature V ppm/°C V ppm/°C PARAMETER TEST CONDITIONS SE5560 Min Typ Max Min NE5560 Typ Max UNIT
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